Updating the README

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@kubeflow-pipeline-bot: The following tests failed, say /retest to rerun them all:

Test name	Commit	Details	Rerun command
mlpipeline-build-image	405d86f	link	/test mlpipeline-build-image
mlpipeline-presubmit-unit-test	405d86f	link	/test mlpipeline-presubmit-unit-test

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